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LTC3413EFE Datasheet(PDF) 5 Page - Linear Technology |
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LTC3413EFE Datasheet(HTML) 5 Page - Linear Technology |
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5 / 16 page  LTC3413 5 3413fc Start-Up 1ms/DIV VIN = 2.5V VOUT = 1.25V LOAD = 0.4Ω OUTPUT VOLTAGE 500mV/DIV INDUCTOR CURRENT 1A/DIV 3413 G13 Load Step Transient 20μs/DIV VIN = 2.5V VOUT = 1.25V LOAD STEP = 0A TO –3A OUTPUT VOLTAGE 100mV/DIV INDUCTOR CURRENT 1A/DIV 3413 G12 TYPICAL PERFORMANCE CHARACTERISTICS SVIN (Pin 1): Signal Input Supply. Decouple this pin to SGND with a capacitor. SVIN must be greater or equal to PVIN, however, the difference between SVIN and PVIN must be less than 0.5V. PGOOD (Pin 2): Power Good Output. Open-drain logic output that is pulled to ground when the output voltage is not within ±10% of regulation point. ITH (Pin 3): Error Amplifier Compensation Point. The current comparator threshold increases with this control voltage. Nominal voltage range for this pin is from 0.2V to 1.4V with 0.6V corresponding to the zero-sense voltage (zero current). VFB (Pin 4): Feedback Pin. Receives the feedback voltage from the output. RT (Pin 5): Oscillator Resistor Input. Connecting a resistor to ground from this pin sets the switching frequency. VREF (Pin 6): Reference Voltage Input. The positive input of the internal error amplifier senses one-half of the volt- age at this pin through a resistor divider. RUN/SS (Pin 7): Run Control and Soft-Start Input. Forcing this pin below 0.5V shuts down the LTC3413. In shutdown all functions are disabled drawing < 1μA of supply current. A capacitor to ground from this pin sets the ramp time to full output current. SGND (Pin 8): Signal Ground. All small-signal components and compensation components should connect to this ground, which in turn connects to PGND at one point. PVIN (Pins 9, 16): Power Input Supply. Decouple this pin to PGND with a capacitor. SW (Pins 10, 11, 14, 15): Switch Node Connection to Inductor. This pin connects to the drains of the internal main and synchronous power MOSFET switches. PGND (Pins 12, 13): Power Ground. Connect this pin closely to the (–) terminal of CIN and COUT. Exposed Pad (Pin 17): Should be connected to PCB ground. PIN FUNCTIONS |
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